Impact of Standardized Nursing Guidelines on the Respiratory Oxygenation index (ROX) optimization and Clinical Outcomes Among Patients with Acute Respiratory Failure Receiving Non-Invasive Ventilation

Abstract

Background: Non-invasive ventilation is a cornerstone intervention for acute respiratory failure; however, its success is frequently compromised by patient intolerance, interface complications, and delayed escalation of care. While protocolized nursing care is theorized to optimize outcomes, its direct impact on objective prognostic markers like the ROX index remains underexplored. Aim: To evaluate the impact of standardized nursing guidelines on optimizing the oxygenation index and clinical outcomes in patients with acute respiratory failure receiving non-invasive ventilation. Design: Randomized controlled trial. Setting: The study was conducted in the intensive care unit. Subjects: A convenience sample of 60 adult patients diagnosed with acute respiratory failure and requiring Non-invasive ventilation were recruited and randomly allocated into two equal groups: the study group (n = 30) and the control group (n = 30). Method: The control group received routine ICU care, while the study group received a standardized nursing guideline incorporating protocolized chest physiotherapy, targeted interface management, and proactive complication prevention. Data collection Tools: Data were collected using four instruments: (1) an acute respiratory failure assessment sheet, (2) Acute Physiology and Chronic Health Evaluation II (APACHE II  ) score, ( 3) Non-invasive ventilation failure assessment tool(Rox index score), and (4) a clinical outcomes assessment tool related to Non-invasive ventilation. Results: The study group demonstrated a rapid and sustained optimization of the ROX index, with 100% achieving a low-risk classification (≥4.88) by 12 hours, compared to only 36.7% in the control group (p < .001). By the final assessment day, the study group exhibited significant improvements in arterial blood gas parameters, notably higher PaO₂ (101.4 ± 44.5 vs. 83.5 ± 20.7; p = .0470), lower PaCO₂ (38.35 ± 2.64 vs. 48.3 ± 14.2; p = .001), and a significantly lower incidence of NIV-related complications, particularly air leaks (0.0% vs. 36.7%; p < 0.001( and gastric distension(16.7%vs. 30.0%; p = 0.360(  Conclusion: The implementation of structured nursing guidelines significantly accelerates respiratory stabilization, optimizes the ROX index, enhances gas exchange, and mitigates NIV-related complications in patients with acute respiratory failure. Recommendations: The integration of protocolized nursing guidelines, incorporating serial ROX index monitoring, should be standardized in ICUs to enhance NIV efficacy, prevent iatrogenic complications, and improve overall patient safety.